Truck for railroad rolling stock



Feb. 8, 1927. Y 1,616,511 7 v F F. SCOVlLLE 4 TRUCK FOR IQAILROAD ROLLING STOCK Filed De 18. 1924 2 Sheets-Sheet 1 ATTORNEY.

V -FlG-7 8, I F. F. SCOVILLE I -TRUCK FOR RAILROAD ROLLING STOCK Filed Dec. 18. 1924 2 Sheets-Sheet 2 BY; KM

' ATTORNEY Patented Feb. 8, 1927.

end elevation thereof partly in section; F ig..

ts? stems FRANK F. SCQVI-LLEOF scHEN-EGTADY, NEW roan.

TRUCK ron RAILROAD .RoLLIne' sa ocK. l

Application filed DecemberIS, 1924. Seria1N:o. 756,678.

Fig. 1 is a partial plan of an engine truck embodying my invention; Fig. 2 is an 3 1s a side elevation thereof; Fig. 4 is an.

elevation of one of the supporting rockers;

Fig. 5 shows a portion of the frame having a modified form of track; Fig. 6 shows in elevation a modified form of the supporting rockers, the connecting pins being in sec tion on line VI-VI of Fig. 7; and Fig. 7 is a bottom plan of the form shown in Fig. 6, but removed from the truck.

My invention relates to trucks for railway rolling stock and its object is to provide a centering mechanism for trucks of the swing or lateral motion type which affords any desired amount of initial resistance while permitting such lateral motion as may be required by the deflection of the truck in passing around curves. My invention also prevents undue wear and .the necessity for lubrication by the'provision of rolling contact between the relatively movable members in the lateral traverses of the truck. My invention is designed to provide an even distribution of the load on the rockers whch support the bolster upon the truck. My invention also comprises the various features which I shall hereinafter describe and claim. 7 7

Referring to the drawings, 2 indicates the truck frame which is supported through the springs 3 on the journal boxes 4, which are mounted on the axle 5. The truck wheels 6 are secured on'the axle 5. The frame 2 has parallel transversely extending trackways 7, each of which has teeth 8 with bevelled upper faces arranged at intervals along one side of eachsuch track 7.. Operating along the trackways 7 are the rockers 9, which are pivotally mounted upon 7 and support the bolster 10. The rockers 9 have lugs 11 along their outer side faces which engage the teeth 8 in the trackways 7 to prevent the rockers from slipping-out of place in such a central flattened port-ion 13 which furnishes an initial resistance to movement of the frame 2 relative to the bolster 10 and also assists in bringing the bolster to centered from the vertical axis of the truck, which is indicated in Fig. 3 bythe line A, while the continuously that when the bolster trackways 7. The faces 12 V of the rockers are arc-shaped, but each hasvertcal axis of the ,bolster in'su' ch displaced position is indicated bythe lineB. It will be seen that, as shown in Figs. 3 and 4, the contact point of the rockers on the track is of the load on the rockers 9 and thereby overin advance of the bearing pins 14, which produces a more even dlstr butlon comes any tendency of the bolster to over ride the outer rocker. 7

To prevent the bolster fromv becoming disengaged from the truck frame in case of derailment or other emergency chains or other limiting means may be employed.

In Fig. 5 I have shown a modified form of trackway frame 15 isformed partly in shallow arcs 16, and thereby tends both to limit definitely the travel of the rockers therealong-and to center them.

in which the track on the truck" In Figs. 6 and 7 I have shown a'modified form of supporting rocker for the bolster in which the rocker 17 instead of having a'flattened central portion in its arc-shapedface 18 hasa kidney-shaped opening 19 for two pins or fulcrum bearings 20, 21, each half of the opening being of slightly greater width than the pin contained therein so as to permit the rocker 17 to move about the pins without binding. The rockers'17 are arranged in the same tion both pins 20, 21 will take up the same proportion of the weight of the bolster and there will thus be a certain amount of initial can tilt and thusshift the weight to one or the other ofthe pins. 77

It will be seen that as the rockers ,roll

laterally away from the return by ous structural modifications are possiblewithin the scope of the invention claimed.

lVhat I claim is: v 1. In a railroad truck, the combination of a fram centered positions, the distance between their points of support and the trackways in which they operate inresult that there is a condescription I e; trackway's extending transhorizontal plane so. 22 is m centered posicc resistance to. overcome before a rocker 17 l versely of the frame; a bolster adapted to ,move ,Jtranversely relative to the frame; rockers supporting the bolster having areshaped faces engaging. said trackways, each of said rockers having a portion of the face "contacting with the trackway of a contour departing from the arc in which the re-' mainder of said face is struckto provide an initial. resistance to motion of the bolsterrelativeto the truck.

2.1111 a raiiroadtr lck, the combination of a frame a bolster vadapted to move laterally relative thereto; supports for the bolster as to offer a variable resistance to progressive lateral movement of the bolster relaative to the truck. r Y Y I FRANK F. SCOVILLE. 

